The late Ibn Badran al-Hanbali al-Dimashqi in his book al-Madkhal ila Madhab al-Imam Ahmad (Introduction to the Madhab of Imam Ahmad) mentions a list of Hanbali/Athari books on creed, and they are as follows:

We may also add to the Sheikh’s list the books of Sh Muhammad ibn Abd al-Wahhab, and the most unique and important of them: Kitab al-Tawheed…
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As for al-Shawkani, I believe there is a book out there on his beliefs. A study of his Tafseer Fath al-Qadir shows that he is very Salafi for the most part of his creed. Although, I did become surprised at his Tafseer for the verses pertaining to Abrahamic contentions (where he sees the sun rise and says: This is my Lord). In this particular part of his tafseer he seems to have bought the Ash'ari tafseer of hulul al-hawadith (negation of 'movement' from Allah) at face value.